JPS5932348Y2 - Device for adjusting the angle of the back of a chair - Google Patents

Description

[Detailed description of the invention] The present application relates to a luffing angle adjustment device for a chair,
The structure is such that the undulation angle can be adjusted automatically and stepwise by simply rotating the lending part.

Conventionally, there has been known a device for adjusting the tilting angle of a chair for this type of ρ chair, as disclosed in Japanese Utility Model Application No. 50-90808.

This device has a guide member provided with a plurality of engagement recesses, and a sliding plate provided with a plurality of engagement recesses, and the sliding plate is placed in a first position where the surface engagement recesses match each other with respect to the guide member. It is installed so that it can be moved from the operating state to a second operating state in which both the engaging recesses are offset from each other, and in the first operating state, the locking rod pivoted on the tip is sequentially moved into the engaging recess. In order to engage the locking rod and prevent the locking rod from engaging with the locking recess in the second operating state, a groove is inserted downwardly toward the column at a position between each of the locking recesses on the upper edge of the sliding plate. A protrusion that is inclined as a curved surface that is slightly higher than the top of the guide member is provided toward the opposite side, and a locking rod that is biased by a spring and is pivotally supported by the tip is attached to the protrusion. The sliding plate is configured to slide in contact with the sliding plate.

However, according to this configuration, each time the locking rod switches engagement from one engagement recess to the next engagement recess, the sliding plate is first moved to the second operating state, and then the sliding plate is moved to the second operating state. This is achieved by restoring the sliding plate to the first operating state again by the action of the locking rod and the protrusion, but moving the sliding plate from the first operating state to the second operating state. In this case, first move the locking lever to the base side using the tip and move it over the protrusion to position it on the upper edge of the sliding plate, then lower the tip in the opposite direction to the above. In this case, the locking rod must be moved in the opposite direction, and the sliding plate must be moved to the second operating state by the action of the protrusion and the locking rod.

That is, according to the known device, the action of the slightly protruding protrusions provided between the respective engaging recesses and the locking rod pivotally connected to the latch, as well as the action of the spring force urging the locking rod. As a result, the sliding plate is slid between the first operating state and the second operating state each time an adjustment is made, which makes the structure complex, and the operation is extremely unstable and uncertain, leading to the risk of malfunction. Not only that, but also the operation for adjusting the undulation angle was troublesome.

Therefore, the present application provides that while the backrest's undulating motion reaches its ultimate position, the undulating angle can be adjusted arbitrarily, and when the undulating motion of the backrest reaches its ultimate position, the sliding plate is moved from the first operating state. The present invention provides a second operating state or a device for adjusting the elevation angle of a backrest, which is slidable from the second operating state to the first operating state to adjust the elevation angle of the backrest again. To explain the embodiment with reference to the drawings, A shows a main frame 1 in which a rear leg part 1a and a seat support part 1b are integrally formed, and a lending frame 3 whose lower end is pivoted 2 at an intermediate position of the main frame 1. and,
It is a wooden frame body consisting of a front leg frame 5 whose upper end is pivoted 4 at the front position of the main frame 1, and an adjustment device 6 for adjusting the undulation angle of the lending frame 3. A pine door is installed across the lending frame 3, and the adjusting device 6 is a locking mechanism that connects the lower ends of a pair of arms 9 whose upper ends are pivotably mounted 8 to the right and left positions of the lending frame 3. The shaft 10 is configured to engage in stages in a plurality of engagement recesses 11 a, 11 b, and 11 C spaced apart along the left and right upper edges of the rear leg portion 1 a of the main frame 1 .

Reference numeral 12 denotes a sliding plate made of a long plate material, which has a plurality of engaging recesses 13a, 13b, and 13C spaced apart along the upper edge, each of which matches the respective engaging recesses. Abutment pieces 14 and 14' are protruded from the upper edge positions of both ends in the transverse direction, respectively, to abut against each other as the engagement shaft 10 moves.

This sliding plate 12 has two parts that protrude from the inner surface of the main frame 1.
A first operation in which the book's stopper shaft 15.15' is engaged with the engagement recesses 13a, 13b, 13C of the sliding plate 12 and the engagement recesses 11a, 11b, IIC of the main frame 1. elongated hole 1 that allows limited sliding of the sliding plate 12 from the position to the second operating position where they are offset from each other;
6 is provided.

17 is a stop that holds the sliding plate 12 so that it slides along the inner surface of the main frame 1, and is connected to the stopper shaft 15.
They are screwed onto the ends of the 15' ends.

Reference numeral 18 indicates that when the sliding plate 12 is located at the second operating position, the iron piece 19 provided on the end surface of the sliding plate 12 is attracted to the sliding plate 12.
This is a magnet that prevents unnecessary sliding of the main frame 1 and is attached to the inner surface of the main frame 1.

In the backrest elevation angle adjustment device constructed in this way, the engaging recesses 11a and 13a are arranged as shown in FIG.
, 11b and 13b, and 11C and 13C are in agreement with each other, if the creditor frame 3 is rotated in the upright direction, the engagement shaft 10 will move into the engagement recess along with the rotation. They are engaged in a stepwise manner, and as a result of this engagement, the lending frame 3 gradually increases its standing angle.

The engagement recess 11 is located at the end position of the retaining shaft 10 in the upright direction.
When returning the backrest 3 to the prone direction from the state where it is engaged with a and 13a, the backrest 3 is temporarily rotated in the upright direction.

Then, the engagement shaft 10 escapes from the engagement recesses 11a and 13a and rides on the upper edge of the main frame 1, and the abutment piece 14 at the front end position engages and the abutment piece 14 is attached to the backrest 3. It is pulled in the direction of rotation.

As a result, the sliding plate 12 moves along the inner surface of the main frame 1 from the first operating position to the second operating position as shown in FIG. The engagement recesses 13a, 13b, and 13C are offset from each other, and the iron piece 19 is attracted to the magnet 18.

Therefore, the upper edge surfaces of the main frame 1 and the sliding plate 12 become a flat surface P with no unevenness, and when the backrest 3 is rotated from this state in the prone direction, the engagement shaft 10 moves in the direction of the arrow in FIG. 4 while sliding on the flat surface P, and then the retaining shaft 10 abuts against the rear abutting piece 14'.

As a result of this collision, the iron piece 19 separates from the magnet 18, and the sliding plate 12 slides in the same direction within the elongated hole 16, returning from the second operating position to the first operating position, and sliding again. The engagement recesses 13a, 13b, 13C of the plate 12 match the engagement recesses 11a, 11b, 11C of the main frame 1, and the engagement shaft 10 is located at the end in the direction in which the creditor frame 3 falls down. By engaging with the engaging recesses 11C and 13C, the lending frame 3
is maximum and prone.

When the lender frame 3 is rotated again in the upright direction from this state, the undulating angle of the lender frame 3 is automatically adjusted.

FIG. 6 shows another embodiment in which the sliding plate 12 is slidably attached to the left and right inner surfaces of the main frame 1, in which an L-shaped guide groove 20 is formed along the length direction of the upper surface. The member 21 is fixed to the left and right inner surfaces of the rear leg portion 1a of the main frame 1 with screws 22 or adhesive, and the sliding plate 1 is fixed to the guide groove 20.
between the side surface of the sliding plate 12 and the rear leg portion 1a;
A case is shown in which a piece 23 having an appropriate frictional force such as leather or resin is interposed and this is adhered to the sliding plate 12 side, so that the sliding of the single-shaped portion 12' with respect to the guide groove 20 is prevented. The stroke is limited to the extent that the sliding plate 12 moves from the first working position to the second working position.

With this configuration, the sliding plate 12 and the rear leg portion 1a are always in frictional contact, so the iron piece 19 and magnet 18 described above can be omitted.

As described above, according to the present application, in the first operating position where the first engagement recess of the rear leg and the second engagement recess of the sliding plate match, the retaining shaft is inserted into the engagement recess at an arbitrary position. It is convenient to adjust the undulation angle as it can be selectively engaged with the
Movement of the sliding plate from the first operating position to the second operating position or from the second operating position to the first operating position is achieved by abutting the retaining shafts relative to abutment pieces set at both end positions of the sliding plate. Since this is done by sliding the backrest, it is extremely easy to adjust the raising and lowering of the backrest, and the operation is reliable and there is no risk of malfunction.Moreover, the rotation of the backrest can be performed without the need for spring means. It is possible to adjust the undulating angle only by the above-mentioned method, and there is no need to provide a separate member for slidingly guiding the sliding plate, so the structure is simple.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and Fig. 1 is a side view of the chair with the device installed, Fig. 2 is an exploded perspective view of the device with some parts omitted, and Fig. 3 is the first operating state. 4 is a side sectional view of the main parts in the second operating state, FIG. 5 is a sectional view taken along line I-I in FIG. 3, and FIG. It is a sectional view of an example. In the figure, 1 is the main frame, 1a is the rear leg, 3 is the lending frame, 9 is the arm, 10 is the engagement shaft, 11 a , 11 b , 11 C are the engagement recesses in the rear leg, and 12 is the sliding Board, 13 a, 13
b, 13C is an engaging recess of the sliding plate, 14.14' is an abutting piece, 15.15' is a stopper shaft, and 16 is a long hole.

Claims (1)

[Scope of utility model registration request] A plurality of first engagement recesses are provided at intervals along the upper edge of the rear leg portion, and a retaining shaft supported by an arm rotatably attached to the lender frame is engaged with the engagement recesses. In the chair configured to adjust the up-and-down angle of the lender frame, a sliding plate having a plurality of second engaging recesses that respectively match the first engaging recesses is connected to the first engaging recess and the second engaging recess. The slider is slidably connected to the side surface of the rear leg so that it can slide from a first operating position where the two engagement recesses match to a second operating position where the two engagement recesses are offset from each other. At both end positions in the length direction of the plate, extending upward and abutting against the retaining shaft, the sliding plate is moved from the first operating position to the second operating position or from the second operating position to the first operating position, respectively. A rental angle adjustment device with an integrated sliding abutment piece.